Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3819e06ca07b4b1…

MALICIOUS

PDF

73.5 KB Created: 2021-08-28 11:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d20cc1c3275b63bfa78d6589a83c564 SHA-1: 623149f1d42b14c806a5cfa78e4a661abd17219f SHA-256: d3819e06ca07b4b1360d7a8da65d42ed7740f1e80541aa8e99dec8d3a4c644b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous URLs pointing to link farms hosted on compromised WordPress sites and disposable domains. This suggests the document is designed to exploit PDF vulnerabilities to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://store-connector.com/_upload_bilder/_filemanager/file/36025536685.pdf In PDF document text
    • https://circolodelpistone.ch/userfiles/file/42272186430.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/59391855114.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18364e8c1e---zejisaliwiwegigexi.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/50173961866.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/58131919721.pdfIn PDF document text
    • https://wecareprogram.org/images/file/3264046823.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/57570194620.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/dowatutizumiwifinuloxele.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/wusumasedubamawagamufilu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a8b9580956---salokubomojuvawekuk.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/51864937622.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/sogikonofinovoxuve.pdfIn PDF document text
    • http://naturallymine-chicago.com/clients/867610/File/busiziwebuvumenifu.pdfIn PDF document text
    • http://deltools.com/userfiles/file/bumarijugu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/44481768991.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e26c6576d43---4934898669.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/27823550621.pdfIn PDF document text
    • https://renetravel.ro/images/files/gobexesafitudesomi.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/fijiwijurovufuvetigebap.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/h8amj4a0tlav2ap270hmnc0hb9/jigipuzalujomajasizonuvaw.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1ed96499---44438818955.pdfIn PDF document text
    • http://sns.hu/_user/file/goreweravikatapisefululob.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa33960694---11760960993.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/61219869731.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/tetifizemavifutakevo.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/marewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=science+terms+dictionaryPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 14980 bytes
SHA-256: 02db43fa88a641a868eb308d63d62b711cae3b9e4177531231d9e3fa7b6c6ce4
font_02_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 10672 bytes
SHA-256: a58ebd7841f14f88fb5a06ccd47731feb84dbbe5364e776a234e0b915bd9db57

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